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Discussion Starter #1 (Edited)
A few months ago, I did an analysis of family MBTI trends. While most of the trends were inconclusive, I noticed some definite patterns forming with regard to sibling birth order. I will not make note of the results here for the sake of bias, but feel free to check the link in my signature to see for yourself. Anyways, I am looking to collect more data for sibling birth order.

Please only respond if your family matches the following criteria:
- 2 or more children in your immediate family
- Oldest and youngest siblings are biologically related and grew up in the same household
- Neither the oldest or youngest sibling is a twin
- The MBTI types of the oldest and youngest siblings are known

If you meet these criteria, please respond with the MBTI type of the oldest sibling in your family and the youngest sibling. These include yourselves. Middle children are not important to this analysis.

An example response would look like this:
- Oldest - INFJ (me)
- Youngest - ESFP

Thank you for your participation, and I hope to inform you of updated results in the future :)
 

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Discussion Starter #4
Why no twins, may I ask? What if we know birth order?
Birth order is part nature, part nurture. Even if you know who was a few minutes older, both are raised as the oldest/youngest in tandem, making determining a true oldest/youngest sibling nebulous. I'm just trying to cut down on variables where I can, since this method of recording data is highly flawed as is.
 

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Edgelord
INFP 5w4 - ILI - Chaotic Good
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Oldest: ESTJ
Youngest: ENFP
 

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Ah, that makes sense. Although I'm not sure that it will be of use to you, here is information from my maternal and paternal nuclear families.

Paternal family:
Oldest: ISTJ (my dad)
Youngest: ISFP (my uncle)

Maternal family:
Oldest: ESFJ (my mom)
Youngest: ENTJ (my aunt.)

Maternal cousins:
Oldest: ESFJ
Youngest: ESFP

Paternal cousins:
Oldest: ISFJ
Youngest: ESTP

Already seeing an interesting trend in my family. Another thing worth noting is that all oldest/youngest siblings are the same gender.
 

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Older sister: No idea. I haven't talked to her in years.
Me: INFJ
Younger brother: A very obnoxious ENFP.
 

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I thimk INTP
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Please only respond if your family matches the following criteria:
- 2 or more children in your immediate family
- Oldest and youngest siblings are biologically related and grew up in the same household
- Neither the oldest or youngest sibling is a twin
- The MBTI types of the oldest and youngest siblings are known

If you meet this criteria, please respond with the MBTI type of the oldest sibling in your family and the youngest sibling.
Oldest (me) INTP
Youngest (female) ESFJ

You intend to ignore sexuality and age differential? I should think you will lose data that way thus blurring the correlations.
 
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Oldest brother: ISFJ
Second oldest: ESTJ
Youngest brother: ENTP
Me: ENFP
 

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Me(Oldest): ISFP/IXXX
Sibling (Middle): ESFP
Sibling (Youngest): ESTJ
 

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Me(Oldest) - INTJ
My brother(Youngest) - ISFP(according to the test, but I personally think he's ISTP)
 

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I sort of fit, but less than others (my sister sort of(?) grew up in our house)
Nonetheless:
Sister: ISFP 9w8 sx/so
Me: Ne-Si axis 9w1 sp/so
Brother: ENFP 6w7 so

My cousins have a good order so I’ll include them too
Oldest (F): ISFJ 6w7 sp/so
Second oldest (f): ESFP 7w6 so/sp
3rd (f): ESTP 7w6 or 3w2 so/sx
Youngest (m): ISTP 9w8 sp/so
 

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Here are some for your project:

Me: INTP
Younger sister: ESTP

My mother's older sister: ISFJ
My mother: ENFP

My SO: ENFJ
My SO's younger sister: ENFP
 

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Oldest (me) - ISTP
Youngest - ESFJ
 

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Older sister- ESFP
Me- INFP
Younger brother- ISTP

They're both pretty much confirmed btw, they took mbti and I based on how I know them it sounds accurate.
 
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